Hey, I have a Macbook Pro, just bought the beta and thought I could share some info. I can only play the game when I open it for the first time. After my first play I have to clear my browsing history otherwise I get this Error, while it loads executables. Error: Module load error: NaCl module load failed: Validation failure. File violates Native Client safety rules. SO IT WORKS IF I CLEAR OUT MY BROWSER'S HISTORY Allright! This seems to have been fixed. It is back, sadly.